I did not know that Mad Men was now on Hulu, but you can catch the season 3 premiere there until September 22, 2009 (if you live in the USA). Hat tip to Mo Ryan.
Don't go getting all excited yet you cord cutters, so far it's more of a "wet your whistle" thing....
Availability Notes:
For the first season, Mad Men episodes were on Hulu. But as the show got more popular, the episodes were taken off Hulu and even on AMC website you only could get clips of episodes but not full ones. Don’t know why they put Season 3 opener on Hulu in full form, but I hope that AMC will put all full eps on Hulu again.